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n. WALKER.I

Belt-Tighteners.

N0.]5l,256. Patented May 26, 1874.

GEORGE VALKR, OF HAMBURG, NEV YORK.

llVlPRQl/EMENT IN BELT-TIGHTENERS.

Specilication forming part of Letters Patent No. l5 1,256, dated May 26,1374 application lilrd April 18, 1874.

To all. whom t may concern:

De it known that I, GEORGE VALKER, of Hamburg, in the county of Erie andState of New York, have invented certain Improvements inBelt-Tighteners, of which the follow ing is a specification:

This invention relates to devices for tightening and loosening beltsoperated by bandwheels on vert-ical shafts 5. and the invention consistsin the construction, arrangement, and operation of a hollow tightening-pulley, a hollow arbor-standard, and a clamp uniting the pulleywith a swinging belt-guide. I-t further consists in the construction ot'the crane-standard, all as hereinafter explained.

In the drawings, Figure l is a plan, Fig. 2 a side elevation, Fig. 3vertical section, of the pulley, 85e.; Figs. 4, 5, and 6, detail views.

A is the bed or floor; B, the driving-wheel on vertical shaft a; and O,the driving-pulley on vertical shaft b carrying the belt c. D is ahollow tightening-pulley,having a raised hollow top, d. In the center ofthis is a spindle or arbor,l e, having a boss or hub, c', at the top,and through this is formed an oil-hole, f, with a side vent, as shown inFig. 3, to discharge the oil into a hollow arbor-standard, g, in whichthe arbor c of the pulley D revolves. This has an oil-groove, It,extending from top to bottom, (see Figs. 3 and 4,) and which will beplaced in the side having the least wear. The upper part of this hollowarbor-standard gis made into an enlarged cylindrical oil-chamber, z',with a contracted opening from same in the top of the standard, whichopening is of a little larger diameter than the boss of thepulley-arbor, and in which the boss revolves. k is a plug forming partof or attached to the crane E in any suitable manner, and sitting in thebottom of the hollow standard g, and having a hardened point, smaller incircum ference than the rest, and upon which the end ofthe arbor e ofthe pulley D revolves. This may be attached to a sliding bed instead ofthe crane E. This plug or step k also has a shoulder, m, provided with apackingring, n. When the tighteningpulley is set up for use, as in Fig.2, the plug l is taken out and oil poured into the hole j' until thearbor standard is filled. The plug l is then set in, and by this meansthere will be a sufficient supply to last several weeks, and it will bekept clean all the time. The crane E swings on a vertical standard, F,having abaSe-ilange, p, fastened down in any suitable manuer to theHoor, Ste., or it may be inverted and bolted to the under side of asupport, if required. The standard is encircled by an adjustable collar,q, fastened with a set-screw, 1*, to support the crane and adjust it toa proper height.

As before stated, the crane may be done away with and a sliding bedsubstituted, if desired; also, the arbor-standard may be cast in onepiece with the crane or separate, and fastened thereto or to a slidingbed and operated thereby.

G is a clamp, which encircles the hollow arbor-standard g inside thehollow pulley D. It will usually be made in two parts boltedtogether byears or side flanges for convenience in setting loosely around thearbor-standard, on which it turns. It has formed on or attached to it anarm, G', projecting at right angles from the bottom and resting on thecrane or a sliding bed, E. The interior of the clamp is a circle at thebase and widens from bottom to top.

The outer end of the arm G is attached, as shown, to a swingingbelt-guide, H, in which this side or portion of the belt runs to keep itfrom sagging or bending over out of a true line of motion. Opposite thisis the usual stationary belt-guide I. One end of the swinging beltguideH is fastened to the arm G', by which it is supported and held at auniform distance from pulley D, the enlargement of the clamp from bottomto top, together with a ridge on the center of the bottom of each part,lallowing the clamp to tip either way in the direction of its transverseaxis, so that the parts may accommodate themselves to any inaccuracy oflevel in the crane E or swinging guide II. The other end of the swingingbelt-guide is attached to the belt-rest s by a pin, t, set into amortise or slot, u, notched in the belt-rest, thus giving it sufficientplay as it swiu gs either way. The pin may be set in the rest and theslot be in the bottom of the guide, if desired. J is a stud to keep thecrane in position when idle. L is a stud with a neck to turn a cord,

w, around, one end of cord of course attached to end of crane, and theother end of the cord ing a saving of material and mechanical labor insetting up in comparison with others. lThe guide will be made of anylength required.

I claiml. In a belt-tightener, the combination of the flangedcranestandard F p, adjusting-ring q, and screw r, with the crane E, asand for the purpose set forth.

l 2. In combination with the standard F and swinging crane E, the hollowarborstandard g, steps k m, and hollow pulley D, having the The swingingguide is also very imporinterior arbor e o', substantially as and forthe purpose described.

3. In a belt-tightening mechanism, the hollow pulley D, having theinterior arbor c cf, in combination with the hollow arbor-standard g,substantially as and for the purpose described. y

4. The clamp G G in combination. with the hollow arbor-standard g andswinging guide II, as and for the purpose specified.

5. The swinging beltguide H, pivoted to the belt-rest s, and attached tothe crane E in any suitable manner, to move with the pulley D, as andfor the purpose specified.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

GEO; WALKER.

Ivi tnesses:

J. DRA'KE, T. H. PARsoNs.

